Direct conversion
Convert inch of water [inH2O] to megapascal [MPa] instantly with formula, examples, chart, and FAQs.
1 inch of water [inH2O] = 0.000249 megapascal [MPa]
1 inch of water [inH2O] = 0.000249 megapascal [MPa]
Example: 1 inch of water [inH2O] equals 0.000249 megapascal [MPa].
Pressure conversions use pascal as the reference unit and include common engineering, weather, tire, and laboratory pressure units.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-08-14.
The inch of water (inH2O) is a pressure unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse inch of water when comparing pressure values, checking specifications, converting between systems, or preparing quick estimates.
The megapascal (MPa) is a pressure unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse megapascal when comparing pressure values, checking specifications, converting between systems, or preparing quick estimates.
| inch of water [inH2O] | megapascal [MPa] |
|---|---|
| 1 | 0.000249 |
| 2 | 0.000498 |
| 5 | 0.001245 |
| 10 | 0.002491 |
| 20 | 0.004982 |
| 25 | 0.006227 |
| 50 | 0.012454 |
| 100 | 0.024909 |
| 1000 | 0.249089 |
Use this formula: 1 inch of water [inH2O] = 0.000249 megapascal [MPa] Enter your value in the calculator and the result updates instantly.
1 inch of water [inH2O] equals 0.000249 megapascal [MPa].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.